Isotopes
| Isotope |
Half-life |
Decay mode |
Discovery year |
Reaction |
|---|---|---|---|---|
| 278Uut | 000000024 !0.24 ms | α | 2004 | 209Bi(70Zn,n) |
| 282Uut | 0000070 !70 ms | α | 2006 | 237Np(48Ca,3n) |
| 283Uut | 000010 !0.10 s | α | 2003 | 287Uup(—,α) |
| 284Uut | 000048 !0.48 s | α | 2003 | 288Uup(—,α) |
| 285Uut | 00055 !5.5 s | α | 2009 | 293Uus(—,2α) |
| 286Uut | 0020 !20 s | α | 2009 | 294Uus(—,2α) |
| 287Uut | 1200 !20? min | α, SF ? | unknown | — |
Ununtrium has no stable or naturally-occurring isotopes. Several radioactive isotopes have been synthesized in the laboratory, either by fusing two atoms or by observing the decay of heavier elements. Six different isotopes of ununtrium have been reported with atomic masses 278 and 282–286; they all decay through alpha decay.
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